Actually inadvertently helped me anyway this thread! So thanks.
Code:
<if condition="is_member_of($post, 29) AND is_member_of($bbuserinfo, 6)"></br>vip</if>
I have this in the postbit to show me(admin group 6) if someone is vip(donator group 29) or not.
Helps me a lot. We have a thing where we're trying not to make donating a badge of honour but it's still handy for me.
Just posting for reference.